× qm,G2=1000kg/h,w1=12%,w2=3%,θ1=15,θ2=28,cs=1.3,t0=25℃,H0=0.001kg/kg干空气,t1=70℃,t2=45℃,I1=I2qm,GC=1000×(1—0.12)=880(kg/h),x1=12/88=0.136,x2=3/97=0.0309qm,GC=880×(0.136—0.0309)=92.5(kg/h)I1=(1.01+1.88H0)t1+2490H0=(1.01+1.88×0.01)×70+2490×0.01=96.9(kJ/kg)I2=(1.01+1.88H2)×45+2490H2=45.5+2574.6H2=96.9(kJ/kg)所以H2=(96.9-145.5)/2574.6=0.02(kJ/kg干空气)若要I1=I2,需QD=21375kg/h